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ST72334J Datasheet(PDF) 44 Page - STMicroelectronics

Part No. ST72334J
Description  8-BIT MCU WITH SINGLE VOLTAGE FLASH MEMORY, ADC, 16-BIT TIMERS, SPI, SCI INTERFACES
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Maker  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
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ST72334J Datasheet(HTML) 44 Page - STMicroelectronics

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I/O PORTS (Cont’d)
6.1.3 I/O Port Implementation
The I/O port register configurations are summa-
rised as following.
Standard Ports
PA5:4, PC7:0, PD7:0, PE7:4, PE1:0, PF7:6, PF4
Interrupt Ports
PA2:0, PB6:4, PB2:0, PF1:0 (with pull-up)
PA3, PB7, PB3, PF2 (without pull-up)
Switching these I/O ports from one state to anoth-
er should be done in a sequence that prevents un-
wanted side effects. Recommended safe transi-
tions are illustrated in Figure 33 Other transitions
are potentially risky and should be avoided, since
they are likely to present unwanted side-effects
such as spurious interrupt generation.
Figure 33. Interrupt I/O Port State Transition
True Open Drain Ports
PA7:6
Table 9. Port Configuration
MODE
DDR
OR
floating input
0
0
pull-up input
0
1
open drain output
1
0
push-pull output
1
1
MODE
DDR
OR
floating input
0
0
pull-up interrupt input
0
1
open drain output
1
0
push-pull output
1
1
MODE
DDR
OR
floating input
0
0
floating interrupt input
0
1
open drain output
1
0
push-pull output
1
1
MODE
DDR
floating input
0
open drain (high sink ports)
1
01
pull-up/floating
interrupt
INPUT
00
floating
(reset state)
INPUT
10
open-drain
OUTPUT
11
push-pull
OUTPUT
XX
= DDR, OR
Port
Pin name
Input
Output
OR = 0
OR = 1
OR = 0
OR = 1
Port A
PA7:6
floating
true open-drain
PA5:4
floating
pull-up
open drain
push-pull
PA3
floating
floating interrupt
open drain
push-pull
PA2:0
floating
pull-up interrupt
open drain
push-pull
Port B
PB7, PB3
floating
floating interrupt
open drain
push-pull
PB6:4, PB2:0
floating
pull-up interrupt
open drain
push-pull
Port C
PC7:0
floating
pull-up
open drain
push-pull
Port D
PD7:0
floating
pull-up
open drain
push-pull
Port E
PE7:4, PE1:0
floating
pull-up
open drain
push-pull
Port F
PF7:6, PF4
floating
pull-up
open drain
push-pull
PF2
floating
floating interrupt
open drain
push-pull
PF1:0
floating
pull-up interrupt
open drain
push-pull


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